PhpCss\Ast\Visitor\Explain::visitSelectorSimplePseudoClassPosition PHP Метод

    public function visitSelectorSimplePseudoClassPosition(Ast\Selector\Simple\PseudoClass\Position $position)
    {
        if ($position->repeat == 2 && $position->add == 1) {
            $css = 'odd';
        } elseif ($position->repeat == 2 && $position->add == 0) {
            $css = 'even';
        } elseif ($position->repeat == 0) {
            $css = $position->add;
        } elseif ($position->repeat == 1) {
            $css = 'n';
            if ($position->add != 0) {
                $css .= $position->add >= 0 ? '+' . $position->add : $position->add;
            }
        } else {
            $css = $position->repeat . 'n';
            if ($position->add != 0) {
                $css .= $position->add >= 0 ? '+' . $position->add : $position->add;
            }
        }
        $this->appendText($css);
        return TRUE;
    }